EG95 LTE Module on Raspberry Pi – Very Weak Signal and High Latency

IoT Modules LTE-A Module
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Hi everyone,

I’m working on a project using a Raspberry Pi with the Quectel EG95 LTE module (specifically EG95-E). I’ve successfully configured the module and established a data connection. I can ping public DNS (like 8.8.8.8), but I’m experiencing extremely weak signal quality and very high, unstable latency (see attached ping test results).

System Setup:

  • Module: Quectel EG95
  • Board: Raspberry Pi (using USB interface)
  • Network: Viettel (Vietnam, LTE Band 3 - 1800MHz)
  • AT Commands Used:
    • AT+CSQ → +CSQ: 27,99
    • AT+QCSQ → +QCSQ: "LTE",59,-94,70,-18
    • AT+QENG="servingcell" → Signal RSRP: -92 dBm, RSRQ: -13 dB
    • AT+QNWINFO → "FDD LTE", "45204", "LTE BAND 3", 1700

Observations:

  • The ping test shows frequent latency spikes >2000ms, sometimes >3000ms (see screenshot).
  • Serving cell RSRP and RSRQ seem too low for a stable LTE connection.
  • Signal from neighbor cells (intra/inter) also looks poor.
  • Despite successful TCP connections and data activity, the performance is unusable for real-time or even low-latency communication.

Questions:

  1. Are the current RSRP/RSRQ levels (around -92 dBm / -13 dB) typical for Band 3? Would this explain the poor latency?
  2. Is there a way to force the EG95 module to connect to stronger neighboring cells or prioritize certain cells?
  3. Would switching to another band or modem firmware potentially improve stability?
  4. Could this be an antenna issue (currently using a passive LTE antenna) or something with my board power supply?

Any advice, suggestions, or debugging tips would be greatly appreciated. I’ve attached screenshots of AT logs and ping results.

Thanks in advance!

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Hi @Long_Ph_m_Van
I noticed in QENG’s return data that the SNR was very poor, at -3. This indicates the presence of downlink interference, which could be inter-cell co-frequency interference within the network, or external interference. This cannot be confirmed. I think switching to a card from a different operator might work.